A Microsoft Account is a "connected account" that is not tied to the device itself, and a Microsoft Account can be used on any number of devices. Windows Store apps, settings and data can be accessed from any device you sign in to via cloud storage.

Changing the operating system from Microsoft Vista to Windows XP can cause the Bluetooth adapter 350 and 355 to no longer work. The link below takes you to an article that provides information on how to download and install patches that allow them to work again.